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Find the World's Best Unix Freelancers

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Josep E. - Ruby on Rails and Full Stack Web Developer

Josep E.

Ruby on Rails and Full Stack Web Developer

$75/hr
61 hours
Spain
New to Upwork
  • Ruby
  • Ruby on Rails
  • jQuery
Kateryna T. - Front End Developer

Kateryna T.

Front End Developer

$28/hr
289 hours
Portugal
100% JOB SUCCESS
“Kateryna did an AMAZING job. She accepted a last minute project and completed within deadline to pixel perfectness and went above and beyond expectations. She's very cool, and...”
  • HTML
  • CSS
  • jQuery
  • Magento
Naveen S. - Help Desk Specialist

Naveen S.

Help Desk Specialist

$12/hr
3,016 hours
India
100% JOB SUCCESS
“Great job! He went beyond the given material to complete the task! I'll def work with Naveen again!”
  • Customer service
  • Helpdesk
Iulian D. - Senior Network/System Engineer

Iulian D.

Senior Network/System Engineer

$15/hr
115 hours
Romania
100% JOB SUCCESS
“This guy is truly amazing. I was hesitant to hire him because of the low rate, but he is a true professional. He set up 20 servers for us, secured them, and installed software...”
  • Network Monitoring
Ilya V. - Full-Stack, Backend Developer

Ilya V.

Full-Stack, Backend Developer

$40/hr
519 hours
Russia
100% JOB SUCCESS
“Excellent work, very knowledgeable. I will definitely hire again.”
  • AngularJS
  • Node.js
  • PHP
  • HTML5
Roman S. - Professional Mobile UI/UX Designer.

Roman S.

Professional Mobile UI/UX Designer.

$38/hr
154 hours
Ukraine
100% JOB SUCCESS
“Roman is a fantastic designer. He has demonstrated his problem solving skills and design thinking. He is familiar with the mobile UI conventions. He also presented his work very...”
  • Mobile UI Design
Abdul A. - iOS and Android Development Expert

Abdul A.

iOS and Android Development Expert

$30/hr
2 hours
Pakistan
100% JOB SUCCESS
“Azeem is a pleasure to work with! He is always prompt and will work to clear any misunderstandings about the project. I always feel that he has my best interests at heart.”
  • iPhone App Development
Ali H. - Senior Ruby on Rails Developer & Project Manager

Ali H.

Senior Ruby on Rails Developer & Project Manager

$30/hr
370 hours
Bangladesh
100% JOB SUCCESS
“Has been excellent working with Ali. Looking forward to the new future as Backspace LLC. Thanks1”
  • Ruby
  • Ruby on Rails
  • MongoDB
Eric H. - Professional Magento Developer

Eric H.

Professional Magento Developer

$40/hr
144 hours
Germany
100% JOB SUCCESS
“I asked Eric to help my magento site issues in an emergency. He solved them quickly and communicated with me very well. He is really skillful to solve difficult problems. I would...”
  • Magento
  • Zend Framework
  • PHP
Kanstantsin H. - QA Engineer, Professional Tester

Kanstantsin H.

QA Engineer, Professional Tester

$14/hr
522 hours
Belarus
100% JOB SUCCESS
“Kanstantsin was a pleasure to work with, excellent communication and work ethic. Would definitely hire him again.”
  • Software Testing
  • HTML5
  • CSS3
Erik H. - iOS Developer (Objective-C, Swift, Cocoa)

Erik H.

iOS Developer (Objective-C, Swift, Cocoa)

$55/hr
1,070 hours
Sweden
100% JOB SUCCESS
“Erik was incredibly helpful and knowledgeable. He was easy to talk to and took the time to make sure each point was understood, by a laymen like me. I hope to work with him again.”
  • Objective-C
  • Swift
  • Cocoa

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Back-End Technology: The Role of the Back-End Web Developer

Your website or dynamic web application is a sum of layers—structure, design and content, and functionality. The technology and programming that “power” a site—what your end user doesn’t see but what makes the site run—is called the back end. Consisting of the server, the database, and the server-side applications, it’s the behind-the-scenes functionality—the brain of a site. This is the ecosystem of the database manager and the back-end developer.

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